A:
Positive:
1 x 656801655 x 1313603331 x 2118715155 x 423743157 x 418345785 x 836692699 x 243354867 x 13495
Negative:
-1 x -65680165-5 x -13136033-31 x -2118715-155 x -423743-157 x -418345-785 x -83669-2699 x -24335-4867 x -13495
Unfortunately, there's not simple formula to identifying all of the factors of a number and it can be a tedious process when trying to identify the divisors of larger numbers. To find the factor combinations of the number 65,680,165, it is easier to work with a table - it's called factoring from the outside in.
We start by creating a table and writing 1 on the left side and then the number we're trying to find the factors for on the right side in a table. Then, below that, write the numbers as a negative as well.
| 1 | 65,680,165 | |
| -1 | -65,680,165 |
When you multiply two negative numbers together, you get a positive number. That means both the positive and negative numbers are factors of 65,680,165.
Example:
1 x 65,680,165 = 65,680,165
and
-1 x -65,680,165 = 65,680,165
Notice both answers equal 65,680,165
With that explanation out of the way, let's continue. Next, we take the number 65,680,165 and divide it by 2:
65,680,165 ÷ 2 = 32,840,082.5
If the quotient is a whole number, then 2 and 32,840,082.5 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 65,680,165 | |
| -1 | -65,680,165 |
Now, we try dividing 65,680,165 by 3:
65,680,165 ÷ 3 = 21,893,388.3333
If the quotient is a whole number, then 3 and 21,893,388.3333 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 65,680,165 | |
| -1 | -65,680,165 |
Let's try dividing by 4:
65,680,165 ÷ 4 = 16,420,041.25
If the quotient is a whole number, then 4 and 16,420,041.25 are factors. In this case, the quotient is not a whole number. Don't write anything down and try the next divisor.
Here is what our table should look like at this step:
| 1 | 65,680,165 | |
| -1 | 65,680,165 |
If you did it right, you will end up with this table:
| 1 | 5 | 31 | 155 | 157 | 785 | 2,699 | 4,867 | 13,495 | 24,335 | 83,669 | 418,345 | 423,743 | 2,118,715 | 13,136,033 | 65,680,165 |
| -1 | -5 | -31 | -155 | -157 | -785 | -2,699 | -4,867 | -13,495 | -24,335 | -83,669 | -418,345 | -423,743 | -2,118,715 | -13,136,033 | -65,680,165 |
Here are some more numbers to try:
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